A study investigates the effectiveness of a new drug in treating a particular condition. The researchers claim that the drug has a success rate of 80% in the population. To test this claim, a random sample of 500 patients who have taken the drug is selected. The sample proportion of successful outcomes is found to be 0.75. What is the z-score for this one-proportion z-test?




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AP® and SAT® are trademarks registered by the College Board, which is not affiliated with, and does not endorse this website.